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Tungsten (W) monoblock that consists of W according to ITER specifications, oxygen-free high conductive copper (Cu-OFHC), and CuCrZr has been designed in preparation for KSTAR upgrade for steady-state long-pulse operation with 27.5-MW heating power. Finite-element analysis has been performed by ANSYS Workbench. The hydraulic thermomechanical analysis is performed to investigate the optimal design...
The designs of a 220 GHz folded waveguide traveling wave tube (FWTWT) have been reviewed and studied systematically via 3-D electromagnetic particle-in-cell (EM PIC) simulations. 3-D Cold test simulations using both the CFDTD and FEM methods have been carried out and compared with each other as basis for the hot test simulations. The hot test simulation results show that the gain-bandwidth features...
220 GHz FWTWT designs have been reviewed and studied via 3-D CFDTD PIC simulations. 3-D Cold test simulations using both the CFDTD and FEM methods have been carried out and compared with each other as basis for the hot test simulations. The preliminary simulation results show that the gain-bandwidth features at 220 GHz are achievable while carefully avoiding beam interceptions. It is found that that...
For KSTAR divertor, tungsten (W) monoblock has been considered as plasma facing components. W monoblock components consist of three parts; pure W as the plasma facing material, oxygen-free high conductive copper (Cu-OFHC) as the interlayer and CuCrZr alloy as the tube. Finite element analysis (FEA) is performed by using ANSYS WORKBENCH. In this paper, the hydraulic thermo-mechanical analysis is performed...
The feasibility of designing a multistage depressed collector using conformal finite-difference time-domain particle-in-cell simulations has been studied. A feedback mechanism is implemented to provide stable time-dependent voltages for each stage of the depressed collector. An arbitrary space-time dependent spent beam distribution can be given in our time-domain simulations. We demonstrate the design...
The design of slow wave structures for microfabricated millimeter-wave traveling wave tube amplifier is described. Results on critical design parameters, dispersion relations, and output power is also presented. Full three dimensional electromagnetic simulation is performed for cold circuit analysis. And the device performance is evaluated using small and large signal simulations codes.
Power combined millimeter-wave power module (MMPM) is under development for high data rate communications and high-resolution radar applications. The MMPM is comprised of V-band traveling-wave tubes (TWT) that are capable of wide-bandwidth operation with moderately high power. The TWTs are designed with various simulation codes. The circuit utilizes T-shaped BeO support rods. The computational procedures...
Summary form only given. The need for millimeter-wave amplification and its application has been grown rapidly in conjunction with millimeter-wave solid state device development and advancement in microfabrication techniques. This paper present design and analysis of a V-band millimeter-wave traveling wave tube amplifier. Two different slow wave structures (SWS), tunneladder and folded waveguide,...
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